Abstract: The extraction of benzene from benzene/cyclohexane mixture described herein is a process that removes benzene from a benzene/cyclohexane mixture with high selectivity, resulting in an enriched cyclohexane content in the retentate. The process involves adding an aqueous solution of poloxamer 188 to the benzene/cyclohexane mixture and waiting for the mixture to partition into an organic layer above an aqueous layer. Benzene, being more polar than cyclohexane, is selectively drawn into the aqueous layer. Benzene is then removed from the aqueous layer by pervaporation through a composite PDMS (polydimethylsiloxane)/polystyrene membrane. Cyclohexane is recovered from the retentate by drawing off the organic layer of the retentate by any known method. About 97% of benzene has been removed from a 50-50 wt % mixture by pervaporation in the static mode, and about 99% by pervaporation in the continuous mode.

Abstract: The montmorillonite-based liquid chromatography column is a chromatography column, which may be steel, packed with unmodified montmorillonite for use in normal phase liquid chromatography, particularly high-performance liquid chromatography (HPLC). The column may be prepared by sieving montmorillonite to achieve a desired particle size range, preferably in the micrometer range, i.e., montmorillonite microparticles, and more preferably between 5-10 ?m. The montmorillonite microparticles are suspended in a solvent, for example, ethanol, and packed into a column for use in HPLC. Before packing, the montmorillonite microparticles may be dried by, for example, heating for a period of time, e.g., by heating preferably at about 100° C. for at least 2 hours. The packing may be performed at a pressure of at least 5000 psi, and more preferably, between 5000-7000 psi. The column may be used for separation of simple polar compounds under relatively low pressure conditions.

Abstract: A nanoflow detector cell comprises a nanoflow detection cell template defining a sample channel transverse template and a reference channel transverse template, generally parallel to the sample channel, and spaced apart from the sample channel. Clear capillary tubing extends through the sample channel, defining a sample chamber, a portion of the capillary tubing extends out of each end of the sample channel, and is shaped to the template.

Abstract: A nanoflow detector cell comprises a nanoflow detection cell template defming a sample channel transverse template and a reference channel transverse template, generally parallel to the sample channel, and spaced apart from the sample channel. Clear capillary tubing extends through the sample channel, defming a sample chamber, a portion of the capillary tubing extends out of each end of the sample channel, and is shaped to the template.